diff --git a/README.md b/README.md
index 88fff17..ff26840 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,8 @@ A simple web application to be used as an ssh client to connect to your ssh serv
 
 ### Preview
 
-![Login](https://github.com/huashengdun/webssh/raw/master/preview/login.png)
-![Terminal](https://github.com/huashengdun/webssh/raw/master/preview/terminal.png)
+![Login](preview/login.png)
+![Terminal](preview/terminal.png)
 
 
 ### How it works
@@ -132,6 +132,11 @@ Passing an encoding
 http://localhost:8888/#encoding=gbk
 ```
 
+Passing a font size
+```bash
+http://localhost:8888/#fontsize=24
+```
+
 Passing a command executed right after login
 ```bash
 http://localhost:8888/?command=pwd
diff --git a/webssh/static/js/main.js b/webssh/static/js/main.js
index fb43f2c..8f1e7e1 100644
--- a/webssh/static/js/main.js
+++ b/webssh/static/js/main.js
@@ -56,7 +56,7 @@ jQuery(function($){
       key_max_size = 16384,
       fields = ['hostname', 'port', 'username'],
       form_keys = fields.concat(['password', 'totp']),
-      opts_keys = ['bgcolor', 'title', 'encoding', 'command', 'term'],
+      opts_keys = ['bgcolor', 'title', 'encoding', 'command', 'term', 'fontsize'],
       url_form_data = {},
       url_opts_data = {},
       validated_form_data,
@@ -360,12 +360,21 @@ jQuery(function($){
         encoding = 'utf-8',
         decoder = window.TextDecoder ? new window.TextDecoder(encoding) : encoding,
         terminal = document.getElementById('terminal'),
-        term = new window.Terminal({
+        termOptions = {
           cursorBlink: true,
           theme: {
             background: url_opts_data.bgcolor || 'black'
           }
-        });
+        };
+
+    if (url_opts_data.fontsize) {
+      var fontsize = window.parseInt(url_opts_data.fontsize);
+      if (fontsize && fontsize > 0) {
+        termOptions.fontSize = fontsize;
+      }
+    }
+
+    var term = new window.Terminal(termOptions);
 
     term.fitAddon = new window.FitAddon.FitAddon();
     term.loadAddon(term.fitAddon);